{"id":15001,"date":"2021-09-19T19:56:59","date_gmt":"2021-09-19T19:56:59","guid":{"rendered":"https:\/\/freehost.page\/?p=15001"},"modified":"2021-09-19T19:56:59","modified_gmt":"2021-09-19T19:56:59","slug":"true-va-false-trong-php","status":"publish","type":"post","link":"https:\/\/kiencang.net\/true-va-false-trong-php\/","title":{"rendered":"V\u1ec1 TRUE v\u00e0 FALSE trong PHP"},"content":{"rendered":"\n<p>Tr\u00ean <a href=\"https:\/\/www.php.net\/manual\/en\/language.types.boolean.php\" target=\"_blank\" rel=\"noreferrer noopener\">trang php.net<\/a> m\u1edf \u0111\u1ea7u ph\u1ea7n gi\u1edbi thi\u1ec7u b\u1eb1ng c\u00e2u &#8220;This is the simplest type&#8221; t\u1ee9c &#8220;\u0110\u00e2y l\u00e0 ki\u1ec3u \u0111\u01a1n gi\u1ea3n nh\u1ea5t&#8221;. Nh\u01b0ng n\u1ebfu \u0111\u1ecdc th\u00eam th\u00f4ng tin b\u00ean d\u01b0\u1edbi, b\u1ea1n s\u1ebd th\u1ea5y th\u1ef1c ra n\u00f3 kh\u00f4ng \u0111\u01a1n gi\u1ea3n t\u00ed n\u00e0o. V\u00e0 n\u1ebfu ch\u00fang ta kh\u00f4ng \u0111\u1ec3 \u00fd s\u1ebd l\u1eabn nh\u01b0 ch\u01a1i th\u00f4i.<\/p>\n\n\n\n<p>True v\u00e0 False l\u00e0 ki\u1ec3u d\u1eef li\u1ec7u Boolean, t\u1ee9c l\u00e0 n\u00f3 t\u01b0\u01a1ng \u1ee9ng v\u1edbi 2 gi\u00e1 tr\u1ecb \u0111\u00fang ho\u1eb7c sai, trong \u0111\u00f3 true l\u00e0 \u0111\u00fang, c\u00f2n false l\u00e0 sai. PHP kh\u00f4ng ph\u00e2n bi\u1ec7t ch\u1eef hoa ch\u1eef th\u01b0\u1eddng, do v\u1eady b\u1ea1n vi\u1ebft <code>true<\/code>, <code>TRUE<\/code> hay <code>True<\/code> \u0111\u1ec1u \u0111\u01b0\u1ee3c, t\u01b0\u01a1ng t\u1ef1 v\u1edbi <code>false<\/code> c\u0169ng nh\u01b0 th\u1ebf, <code>FALSE<\/code> v\u00e0 <code>False<\/code> c\u0169ng \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n<p>Trong PHP, true v\u00e0 false th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong <a href=\"https:\/\/kiencang.net\/cach-viet-cau-lenh-if-trong-php\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n, v\u00ed d\u1ee5 nh\u01b0 <code>if<\/code><\/a>, n\u1ebfu \u0111\u00fang th\u00ec l\u00e0m \u0111i\u1ec1u g\u00ec n\u00f3, c\u00f2n n\u1ebfu sai th\u00ec l\u00e0m g\u00ec. N\u1ebfu \u0111\u00fang \u1edf \u0111\u00e2y t\u1ee9c l\u00e0 true, n\u1ebfu kh\u00f4ng \u1edf \u0111\u00e2y t\u1ee9c l\u00e0 false.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Chuy\u1ec3n \u0111\u1ed5i sang boolean<\/h2>\n\n\n\n<p>\u0110\u1ec3 chuy\u1ec3n \u0111\u1ed5i r\u00f5 r\u00e0ng m\u1ed9t gi\u00e1 tr\u1ecb th\u00e0nh bool, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng (bool) ho\u1eb7c (boolean). Tuy nhi\u00ean trong ph\u1ea7n l\u1edbn tr\u01b0\u1eddng h\u1ee3p, vi\u1ec7c \u00e9p ki\u1ec3u l\u00e0 kh\u00f4ng c\u1ea7n thi\u1ebft, v\u00ec gi\u00e1 tr\u1ecb s\u1ebd t\u1ef1 \u0111\u1ed9ng \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i n\u1ebfu m\u1ed9t to\u00e1n t\u1eed, h\u00e0m ho\u1eb7c c\u1ea5u tr\u00fac \u0111i\u1ec1u khi\u1ec3n y\u00eau c\u1ea7u m\u1ed9t \u0111\u1ed1i s\u1ed1 bool.<\/p>\n\n\n\n<p>Khi chuy\u1ec3n \u0111\u1ed5i sang ki\u1ec3u d\u1eef li\u1ec7u boolean, c\u00e1c gi\u00e1 tr\u1ecb d\u01b0\u1edbi \u0111\u00e2y m\u1eb7c \u0111\u1ecbnh \u0111\u01b0\u1ee3c xem l\u00e0 <strong>false<\/strong>:<\/p>\n\n\n\n<ul><li>gi\u00e1 tr\u1ecb boolean false t\u1ef1 n\u00f3 l\u00e0 false r\u1ed3i, v\u00ed d\u1ee5 b\u1ea1n khai b\u00e1o $x = false, th\u00ec $x l\u00e0 boolean false;<\/li><li>s\u1ed1 nguy\u00ean 0 \u0111\u01b0\u1ee3c coi l\u00e0 false;<\/li><li>s\u1ed1 th\u1ef1c 0.0 v\u00e0 -0.0 \u0111\u01b0\u1ee3c xem l\u00e0 false;<\/li><li>chu\u1ed7i r\u1ed7ng v\u00e0 chu\u1ed7i &#8220;0&#8221; \u0111\u01b0\u1ee3c xem l\u00e0 false;<\/li><li>m\u1ea3ng kh\u00f4ng c\u00f3 ph\u1ea7n t\u1eed n\u00e0o \u0111\u01b0\u1ee3c xem l\u00e0 false;<\/li><li>ki\u1ec3u gi\u00e1 tr\u1ecb NULL c\u0169ng l\u00e0 false;<\/li><\/ul>\n\n\n\n<p>M\u1ecdi gi\u00e1 tr\u1ecb kh\u00e1c s\u1ebd \u0111\u01b0\u1ee3c xem l\u00e0 <strong>true<\/strong>.<\/p>\n\n\n\n<p>Ch\u00fa \u00fd: -1 \u0111\u01b0\u1ee3c coi l\u00e0 true, b\u1ea5t k\u1ef3 s\u1ed1 n\u00e0o c\u0169ng \u0111\u01b0\u1ee3c coi l\u00e0 true, ngo\u1ea1i tr\u1eeb s\u1ed1 0, b\u1ea5t k\u1ec3 n\u00f3 l\u00e0 s\u1ed1 d\u01b0\u01a1ng hay s\u1ed1 \u00e2m!<\/p>\n\n\n\n<p>B\u1ea1n h\u00e3y nh\u00ecn k\u1ebft qu\u1ea3 true, false b\u00ean d\u01b0\u1edbi \u0111\u1ec3 bi\u1ebft th\u00eam v\u1ec1 ki\u1ec3u d\u1eef li\u1ec7u n\u00e0y:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nvar_dump((bool) \"\");        \/\/ bool(false)\nvar_dump((bool) \"0\");       \/\/ bool(false)\nvar_dump((bool) 1);         \/\/ bool(true)\nvar_dump((bool) -2);        \/\/ bool(true)\nvar_dump((bool) \"foo\");     \/\/ bool(true)\nvar_dump((bool) 2.3e5);     \/\/ bool(true)\nvar_dump((bool) array(12)); \/\/ bool(true)\nvar_dump((bool) array());   \/\/ bool(false)\nvar_dump((bool) \"false\");   \/\/ bool(true)\n?&gt;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">L\u01b0u \u00fd khi s\u1eed d\u1ee5ng h\u00e0m \u0111i\u1ec1u ki\u1ec7n v\u1edbi m\u1ed9t bi\u1ebfn<\/h2>\n\n\n\n<p>C\u00e1ch s\u1eed d\u1ee5ng h\u00e0m \u0111i\u1ec1u ki\u1ec7n ki\u1ec3u nh\u01b0:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if($con){\/\/ c\u00e2u l\u1ec7nh}<\/code><\/pre>\n\n\n\n<p>R\u1ea5t hay \u0111\u01b0\u1ee3c d\u00f9ng v\u00ec n\u00f3 ti\u1ec7n, ch\u00fang ta kh\u00f4ng ph\u1ea3i vi\u1ebft th\u00eam <a href=\"https:\/\/kiencang.net\/toan-tu-so-sanh-va-toan-tu-logic-trong-php\/\" target=\"_blank\" rel=\"noreferrer noopener\">to\u00e1n t\u1eed so s\u00e1nh nh\u01b0 == hay ><\/a> <\/p>\n\n\n\n<p>Ch\u00fang ta hay l\u00e0m \u0111i\u1ec1u n\u00e0y khi g\u00e1n $con l\u00e0 0 ho\u1eb7c 1, t\u01b0\u01a1ng \u1ee9ng v\u1edbi false v\u00e0 true.<\/p>\n\n\n\n<p>Nh\u01b0ng v\u1edbi ch\u00fa \u00fd tr\u00ean th\u00ec ch\u00fang ta ph\u1ea3i h\u1ebft s\u1ee9c c\u1ea9n tr\u1ecdng v\u1edbi TRUE, b\u1edfi v\u00ec v\u1edbi b\u1ea5t k\u1ef3 gi\u00e1 tr\u1ecb n\u00e0o c\u1ee7a $con m\u00e0 kh\u00e1c 0 (d\u00f9 l\u00e0 s\u1ed1 \u00e2m, hay d\u01b0\u01a1ng, hay k\u00fd t\u1ef1) n\u00f3 c\u0169ng \u0111\u1ec1u th\u00e0nh true h\u1ebft.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tr\u00ean trang php.net m\u1edf \u0111\u1ea7u ph\u1ea7n gi\u1edbi thi\u1ec7u b\u1eb1ng c\u00e2u &#8220;This is the simplest type&#8221; t\u1ee9c &#8220;\u0110\u00e2y l\u00e0 ki\u1ec3u \u0111\u01a1n gi\u1ea3n nh\u1ea5t&#8221;. Nh\u01b0ng n\u1ebfu \u0111\u1ecdc th\u00eam th\u00f4ng tin b\u00ean d\u01b0\u1edbi, b\u1ea1n s\u1ebd th\u1ea5y th\u1ef1c ra n\u00f3 kh\u00f4ng \u0111\u01a1n gi\u1ea3n t\u00ed n\u00e0o. V\u00e0 n\u1ebfu ch\u00fang ta kh\u00f4ng \u0111\u1ec3 \u00fd s\u1ebd l\u1eabn nh\u01b0 ch\u01a1i th\u00f4i. True v\u00e0 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[238],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>V\u1ec1 TRUE v\u00e0 FALSE trong PHP &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/true-va-false-trong-php\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"V\u1ec1 TRUE v\u00e0 FALSE trong PHP &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Tr\u00ean trang php.net m\u1edf \u0111\u1ea7u ph\u1ea7n gi\u1edbi thi\u1ec7u b\u1eb1ng c\u00e2u &#8220;This is the simplest type&#8221; t\u1ee9c &#8220;\u0110\u00e2y l\u00e0 ki\u1ec3u \u0111\u01a1n gi\u1ea3n nh\u1ea5t&#8221;. 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